[swift-evolution] [Review] SE-0104: Protocol-oriented integers

Xiaodi Wu xiaodi.wu at gmail.com
Wed Jun 22 20:13:59 CDT 2016

On Wed, Jun 22, 2016 at 7:52 PM, Chris Lattner via swift-evolution <
swift-evolution at swift.org> wrote:

> Hello Swift community,
> The review of "SE-0104: Protocol-oriented integers" begins now and runs
> through June 27. The proposal is available here:
> https://github.com/apple/swift-evolution/blob/master/proposals/0104-improved-integers.md
> Reviews are an important part of the Swift evolution process. All reviews
> should be sent to the swift-evolution mailing list at
>         https://lists.swift.org/mailman/listinfo/swift-evolution
> or, if you would like to keep your feedback private, directly to the
> review manager.
> What goes into a review?
> The goal of the review process is to improve the proposal under review
> through constructive criticism and contribute to the direction of Swift.
> When writing your review, here are some questions you might want to answer
> in your review:
>         * What is your evaluation of the proposal?

This is excellent, and a huge improvement. Two questions and one ask:

Q1: With the adoption of this proposal, will FloatingPoint conform to
Q2: I do not understand the comment explaining signBitIndex. I thought I
understood what it does from the name, but the comment says it's not the
right name. So what is signBitIndex?
Ask: You've got bitWidth and nthWord. Any way you could expose
__builtin_popcount()? Pretty please?

>         * Is the problem being addressed significant enough to warrant a
> change to Swift?

Yes, the current tangle of protocols is not exactly fun to work with for

>         * Does this proposal fit well with the feel and direction of Swift?


>         * If you have used other languages or libraries with a similar
> feature, how do you feel that this proposal compares to those?

Not applicable, I think.

>         * How much effort did you put into your review? A glance, a quick
> reading, or an in-depth study?

Read the proposal, worked with the existing protocols, thought carefully
about numbers in the context of the FloatingPoint discussion.

> More information about the Swift evolution process is available at
>         https://github.com/apple/swift-evolution/blob/master/process.md
> Thank you,
> -Chris Lattner
> Review Manager
> _______________________________________________
> swift-evolution mailing list
> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution
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